64Cu-DOTA A2 scFv-Fc2 DM With Positron Emission Tomography for the Imaging of Patients With Locally Advanced or Metastatic PSCA-Expressing Pancreatic Cancer

Inclusion Criteria:

* Documented informed consent of the participant and/or legally authorized representative
* Age: ≥ 18 years
* Karnofsky \> 70%
* Advanced (locally or metastatic), histologically confirmed pancreatic adenocarcinoma
* Evidence of locally advanced unresectable or metastatic disease demonstrated by an abnormal imaging scan (computed tomography \[CT\], magnetic resonance imaging \[MRI\], fludeoxyglucose \[FDG\]-PET) within 8 weeks prior to enrollment
* No prior radiation therapy to target lesions
* Hemoglobin ≥ 9g/dL

  * NOTE: Red blood cell transfusions are not permitted within 14 days of hemoglobin assessment unless cytopenia is secondary to disease involvement
* Total bilirubin ≤ 1.5 X upper limit of normal (ULN) (unless has Gilbert's disease)
* Aspartate aminotransferase (AST) ≤ 3.0 x ULN
* Alanine aminotransferase (ALT) ≤ 3.0 x ULN
* Serum creatinine \< 1.4 mg/dL
* Women of childbearing potential (WOCBP): negative urine or serum pregnancy test. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required
* Agreement by females and males of childbearing potential\* to use an effective method of birth control or abstain from heterosexual activity for the course of the study through at least 6 months after the last dose of protocol therapy.

  * Childbearing potential defined as not being surgically sterilized (men and women) or have not been free from menses for \> 1 year (women only)

Exclusion Criteria:

* Chemotherapy, radiation therapy, biological therapy, immunotherapy within 14 days or five half-lives (whichever is shorter for non-radiation therapy) prior to day 1 of protocol therapy
* History of allergic reactions attributed to compounds of similar chemical or biologic composition to study agent
* Clinically significant uncontrolled illness
* Other active malignancy. Patients with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial
* Females only: Pregnant or breastfeeding
* Any other condition that would, in the Investigator's judgment, contraindicate the patient's participation in the clinical study due to safety concerns with clinical study procedures
* Prospective participants who, in the opinion of the investigator, may not be able to comply with all study procedures (including compliance issues related to feasibility/logistics)